Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bb6624a6bba9bf…

MALICIOUS

PDF

45.7 KB Created: 2021-06-08 21:43:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4898ad5499145249e7045d4bcde00703 SHA-1: 085c65383f73a5283c6591a93c05b5b23b154dd6 SHA-256: 16bb6624a6bba9bf0fc0272addd8a82ead43b3608558f63abbe135debc6b47a3
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, with one prominently leading to a redirector associated with game hacks and cheats. The document also instructs the user to copy and paste content into a shell, indicating a potential social engineering lure to execute commands. While no scripts were directly extracted, the nature of the links and the lure suggest a phishing or scam attempt designed to lead the user to malicious sites or encourage command execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/cheat-argent-roblox-vhicule-simulator-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-tiktok-comments_GM835599320.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B3 26224 bytes
SHA-256: d180238c81f7e5fbcb3d87d4e107976edcb90dc9dc01cbb850bad27805a5226b
font_01_sfnt_off00008d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D78 19224 bytes
SHA-256: 2788a054085b1e0ba0925ce69393b40b48f28860d52ff2d5107f83e8db28a946

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